The option that is NOT a part of the digital layer of abstraction is transistors.
In the context of digital abstraction:
- Transistors are generally considered a part of the physical layer (hardware).
- Logic gates, chips, and components work at the higher digital abstraction layer, where they represent logical functions and structures created using transistors.
So, while transistors are crucial for building digital systems, they themselves are not part of the digital layer of abstraction.